Rock core freezing device, rock core freezing control method and control equipment

Abstract

The invention relates to the field of oil-gas exploration and development, and discloses a rock core freezing device, a rock core freezing control method and control equipment. The device comprises: a housing; the inner container is arranged in the shell and used for fixing the rock core fixing device through the inner container opening, so that an interlayer used for storing inert fluid is formed between the shell and the inner container, and the inert fluid is used for absorbing heat of the inner container; the fluid input pipe is arranged on the shell and used for guiding inert fluid into the interlayer; the fluid output pipe is arranged on the shell and is used for leading out the inert fluid from the interlayer; the temperature and pressure sensor is arranged on the shell and used for detecting the temperature and pressure in the inner container and the interlayer; the rock core fixing device is fixed at the top of the shell through the inner container opening, extends into the inner container and is used for storing a rock core sample. The volatilization of light oil in the drilling core can be reduced, the oiliness of the rock can be effectively obtained, and the error of subsequent experimental data can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas exploration and development, and in particular to a core freezing device, a core freezing control method, a storage medium, a control device, and a core freezing control system. Background Art

[0002] The purpose of the background technology description provided here is to give an overall background of the present application. The statements in this section merely provide background related to the present application and do not necessarily constitute prior art.

[0003] The practice of oil and gas exploration and development reveals that the properties of oil reservoirs can be divided into heavy oil, normal oil and light oil according to the density of crude oil. Light oil is more conducive to later exploitation, especially for shale oil. The lighter the oil, the greater the exploitation value.

[0004] However, a major characteristic of light oil is that it is highly volatile and difficult to preserve. Since the oil and gas loss efficiency of samples with different rock properties varies greatly, the degree of oil and gas enrichment in underground samples is often proportional to the oil and gas loss capacity of ground samples. If the rock samples are not scientifically handled, the high-oil content samples obtained by laboratory analysis may just be samples with low oil and gas abundance underground but not easy to lose oil and gas on the ground. The real oil and gas-enriched samples have good rock properties and strong oil and gas loss capacity, which creates the illusion of low experimental results. Therefore, in order to ensure a more realistic evaluation of rock oil content, the drilling site has strict requirements for the preservation and management of the cores out of the barrel, especially the preservation temperature. After the cores are out of the barrel, necessary observations, line recording, and collection of typical core gas leakage on site are carried out, and then the removed cores are frozen and preserved in time.

[0005] However, there are currently no corresponding standards and operating methods for the preservation, sampling and sample preparation of shale oil cores. The General Rules for the Management of Geological Exploration Drilling Cores (DZ / T 0032-92) do not have clear requirements for the environmental temperature of core storage, and there are currently no standardized frozen core devices available on the market. Although some technicians have proposed a liquid nitrogen freezing and closed crushing sample preparation technology to avoid light hydrocarbon loss (Jiang Qigui et al., 2019), this method cannot guarantee the integrity of the core samples and limits subsequent experimental projects and operations.

[0006] Therefore, there is an urgent need for a core freezing device to solve the above-mentioned defects. Summary of the invention

[0007] In view of the above problems, the present application proposes a core freezing device, a core freezing control method, a storage medium, a control device and a core freezing control system. The device disclosed in the present application can reduce the volatilization of light oil in the drilling core, ensure the integrity of the core sample, effectively obtain the oil content of the rock and reduce the error of subsequent experimental data, and has the advantages of simple operation, high accuracy and easy promotion.

[0008] In a first aspect of the present application, a core freezing device is provided, comprising:

[0009] case;

[0010] An inner liner is arranged inside the shell and is used to fix the core fixing device through the inner liner opening to form an interlayer for storing an inert fluid between the shell and the inner liner, and the inert fluid is used to absorb the heat of the inner liner;

[0011] A fluid input pipe, disposed on the shell, and used to introduce the inert fluid into the interlayer;

[0012] A fluid output pipe, disposed on the housing, and used to output the inert fluid from the interlayer;

[0013] A temperature and pressure sensor, disposed on the housing, for detecting the temperature and pressure inside the inner container and the interlayer;

[0014] A core fixing device is fixed to the top of the shell through the inner liner opening and extends to the interior of the inner liner, and is used for storing core samples.

[0015] Furthermore, it also includes:

[0016] A handle is arranged on the top of the shell and is used to take or move the core freezing device.

[0017] Furthermore, it also includes:

[0018] A sliding device is arranged at the bottom of the shell and is used for moving the core freezing device.

[0019] Furthermore, a first fluid valve is provided on the fluid input pipe, which is used to control the switch of the fluid input pipe, so that the inert fluid flows into the interlayer when the first fluid valve is in an open state;

[0020] A second fluid valve is arranged on the fluid output pipe, and is used to control the switch of the fluid output pipe, so that the inert fluid flows out of the interlayer when the second fluid valve is in an open state.

[0021] Furthermore, the core fixing device comprises:

[0022] A bottle cap, arranged on the top of the core fixing device, and used for screwing the inner liner opening to seal the core fixing device;

[0023] A temperature sensor, disposed on the top of the bottle cap, for detecting the temperature inside the core fixing device;

[0024] A fixing frame is arranged at the bottom of the bottle cap and extends to the interior of the inner container, and is used for carrying the core sample.

[0025] Furthermore, the fixing frame comprises:

[0026] Support platform, support bar, core rack bottom plate and core rack retaining ring; wherein,

[0027] One end of the support bar is connected to the bottle cap, and the other end is connected to the support platform through a buffer device; a plurality of blocks are arranged horizontally on the support bar, and a plurality of detachable core rack bottom plates and core rack retaining rings are arranged on the block, and the core rack bottom plate is used to carry the core sample.

[0028] The second aspect of the present application provides a core freezing control method, comprising:

[0029] Controlling a first fluid valve on a fluid input pipe to perform an opening operation, so that an inert fluid flows into the interlayer through the fluid input pipe, so as to freeze the core sample stored in the core fixing device in the inner tank;

[0030] Acquiring the fluid pressure inside the interlayer detected by the temperature and pressure sensor;

[0031] When the fluid pressure is not less than a preset pressure value, the second fluid valve on the fluid output pipe is controlled to open so that the inert fluid in the interlayer flows out through the fluid output pipe, so that the fluid pressure inside the interlayer is maintained within a preset range;

[0032] Obtain the current temperature inside the inner tank detected by the temperature and pressure sensor;

[0033] When the current temperature meets the preset conditions, the inner tank is controlled to maintain the current temperature and the freezing operation of the core sample at the current temperature continues for a preset time.

[0034] Furthermore, before controlling the first fluid valve to perform the opening operation, the method further includes:

[0035] Placing the core sample on the bottom plate of the core holder in the core fixture;

[0036] The bottle cap and the inner liner opening of the core fixing device are controlled to perform a screwing operation so that the core fixing device is in a sealed state.

[0037] The third aspect of the present application provides a control device, including a memory and one or more processors, wherein the memory stores a computer program, and the memory and the one or more processors are communicatively connected to each other. When the computer program is executed by the one or more processors, the steps of the core freezing control method as described above are implemented.

[0038] A fourth aspect of the present application provides a core freezing control system, comprising the core freezing device as described above and the control equipment as described above.

[0039] According to a fifth aspect of the present application, a computer-readable storage medium is provided, wherein a computer program stored in the computer-readable storage medium can be executed by one or more processors to implement the steps of the method described above.

[0040] Compared with the prior art, the advantages or beneficial effects of the technical solution of the present application include:

[0041] The core freezing device disclosed in this application solves the current lack of specialized devices and standard technologies for freezing cores, which is particularly important for shale, which attaches more importance to light oil content. The device disclosed in this application is relatively portable and can be used to quickly preserve drilling cores, reduce the volatilization of light oil in the cores, and ensure the integrity of core samples during the freezing process, so that the oil content of the rock can be accurately obtained later and experimental errors can be reduced; the core freezing method disclosed in this application has the advantages of simple operation, high effectiveness, and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in the relevant field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0043] It should also be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings. The drawings constituting a part of the specification of this application are used to provide a further understanding of the present application. The illustrative embodiments and their descriptions in this application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0044] Figure 1 A schematic diagram of the structure of a core freezing device provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of the structure of another core freezing device provided in an embodiment of the present application;

[0046] Figure 3 A flow chart of a core freezing control method provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of applying a core freezing control method to a core freezing device provided in an embodiment of the present application;

[0048] Reference numerals:

[0049] Figure 1 In: 3-shell, 4-liner, 5-interlayer, 6(a)-second fluid valve, 7-fluid input pipe, 8-fluid output pipe, 6(b)-first fluid valve, 11-integrated temperature and pressure sensor, 12-liner opening, 13-electronic temperature sensor, 14-bottle cover, 15-fixed frame, 16-support platform, 17-support bar, 18(a)-core rack bottom plate, 18(b)-core rack bottom plate, 19(a)-core rack retaining ring, 19(b)-core rack retaining ring, 20-buffer device;

[0050] Figure 2 In: 1-horizontal rod, 2(a)-vertical bracket, 2(b)-vertical bracket, 3-shell, 4-inner liner, 5-interlayer, 6(a)-second fluid valve, 7-fluid input pipe, 8-fluid output pipe, 6(b)-first fluid valve, 9-wheel, 10-fixed baffle, 11-integrated temperature and pressure sensor, 12-inner liner opening, 13-electronic temperature sensor, 14-bottle cover, 15-fixed bracket, 16-support platform, 17-support bar, 18(a)-core rack bottom plate, 18(b)-core rack bottom plate, 19(a)-core rack baffle ring, 19(b)-core rack baffle ring, 20-buffer device, 21-block;

[0051] Figure 4 In the figure: 1-horizontal rod, 2(a)-vertical support, 2(b)-vertical support, 3-shell, 4-inner liner, 5-interlayer, 6(a)-second fluid valve, 7-fluid input pipe, 8-fluid output pipe, 6(b)-first fluid valve, 9-wheel, 10-fixed baffle, 11-integrated temperature and pressure sensor, 12-inner liner opening, 13-electronic temperature sensor, 14-bottle cover, 15-fixed frame, 16-support platform, 17-support bar, 18(a)-core rack bottom plate, 18(b)-core rack bottom plate, 19(a)-core rack baffle ring, 19(b)-core rack baffle ring, 20-buffer device, 21-baffle, 22-second core, 23-first core, 24-liquid nitrogen. DETAILED DESCRIPTION

[0052] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present application and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the protection scope of the present application.

[0053] It should be clear that the embodiments described below are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present application.

[0054] From the background technology, it can be seen that the practice of oil and gas exploration and development reveals that the properties of oil reservoirs can be divided into heavy oil, normal oil and light oil according to the density of crude oil. Among them, light oil is more conducive to later exploitation, especially for shale oil. The lighter the oil, the greater the exploitation value.

[0055] However, a major characteristic of light oil is that it is highly volatile and difficult to preserve. Since the oil and gas loss efficiency of samples with different rock properties varies greatly, the degree of oil and gas enrichment in underground samples is often proportional to the oil and gas loss capacity of ground samples. If the rock samples are not scientifically handled, the high-oil content samples obtained by laboratory analysis may just be samples with low oil and gas abundance underground but not easy to lose oil and gas on the ground. The real oil and gas-enriched samples have good rock properties and strong oil and gas loss capacity, which creates the illusion of low experimental results. Therefore, in order to ensure a more realistic evaluation of rock oil content, the drilling site has strict requirements for the preservation and management of the cores out of the barrel, especially the preservation temperature. After the cores are out of the barrel, necessary observations, line recording, and collection of typical core gas leakage on site are carried out, and then the removed cores are frozen and preserved in time.

[0056] However, there are currently no corresponding standards and operating methods for the preservation, sampling and sample preparation of shale oil cores. The General Rules for the Management of Geological Exploration Drilling Cores (DZ / T 0032-92) do not have clear requirements for the environmental temperature of core storage, and there are currently no standardized frozen core devices available on the market. Although some technicians have proposed a liquid nitrogen freezing and closed crushing sample preparation technology to avoid light hydrocarbon loss (Jiang Qigui et al., 2019), this method cannot guarantee the integrity of the core samples and limits subsequent experimental projects and operations.

[0057] In view of this, the present application proposes a core freezing device, a core freezing control method, a storage medium, a control device and a core freezing control system. The device disclosed in the present application can reduce the volatilization of light oil in the drilling core, ensure the integrity of the core sample, effectively obtain the oil content of the rock and reduce the error of the subsequent experimental data, and has the advantages of simple operation, high accuracy, and easy promotion.

[0058] Embodiment 1

[0059] This embodiment provides a core freezing device, Figure 1 A schematic diagram of the structure of a core freezing device provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the device disclosed in this embodiment includes:

[0060] Shell 3;

[0061] The inner liner 4 is arranged inside the shell 3 and is used to fix the core fixing device 25 through the inner liner opening 12 to form an interlayer 5 for storing an inert fluid between the shell 3 and the inner liner 4, and the inert fluid is used to absorb the heat of the inner liner 4;

[0062] A fluid input pipe 7, disposed on the housing 3, for introducing the inert fluid into the interlayer 5;

[0063] A fluid outlet pipe 8, disposed on the housing 3, and used for outlet the inert fluid from the interlayer 5;

[0064] A temperature and pressure sensor 11 is provided on the housing 3 and is used to detect the temperature and pressure inside the inner liner 4 and the interlayer 5;

[0065] The core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the interior of the inner liner 4 for storing core samples.

[0066] Those skilled in the art can understand that, in this embodiment, the interlayer 5 for storing the inert fluid is a hollow interlayer.

[0067] It should be noted that, in this embodiment, the entire body formed by the shell and the liner can be referred to as a liquid nitrogen tank body.

[0068] It should be further explained that the inert fluid includes liquid nitrogen, and the inert fluid can also be selected according to actual needs.

[0069] As an example, the liquid nitrogen tank body includes an inner liner 4 and a shell 3 , and an interlayer 5 is provided between the inner liner 4 and the shell 3 .

[0070] In some embodiments, a first fluid valve 6 (b) is provided on the fluid input pipe 7, which is used to control the switch of the fluid input pipe 7, so that the inert fluid flows into the interlayer 5 when the first fluid valve 6 (b) is in an open state;

[0071] A second fluid valve 6 ( a ) is provided on the fluid output pipe 8 for controlling the opening and closing of the fluid output pipe 8 so that the inert fluid can flow out of the interlayer 5 when the second fluid valve 6 ( a ) is in an open state.

[0072] Optionally, the distance between the fluid output pipe 8 and the top of the shell 3 is not greater than the distance between the fluid input pipe 7 and the top of the shell 3 .

[0073] As an example, a fluid input pipe 7 and a fluid output pipe 8 are provided on the shell 3 and are connected to the interlayer 5 , and fluid valves are provided on both the fluid input pipe 7 and the fluid output pipe 8 .

[0074] As an example, an integrated temperature and pressure sensor 11 is provided on the shell 3, one connector extends into the inner liner 4, and the other connector extends into the interlayer 5, so as to facilitate the detection of the temperature and pressure of the inner liner 4 and the interlayer 5, thereby ensuring that the core sample is frozen at the most suitable temperature.

[0075] Please refer to the following Figure 2 In some embodiments, the core fixing device 25 comprises:

[0076] A bottle cap 14 is disposed on the top of the core fixing device 25 and is used to screw the inner liner opening 12 to seal the core fixing device 25;

[0077] A temperature sensor 13 is disposed on the top of the bottle cap 14 and is used to detect the temperature inside the core fixing device 25;

[0078] The fixing frame 15 is disposed at the bottom of the bottle cap 14 and extends to the interior of the inner liner 4 for carrying the core sample.

[0079] In some embodiments, the fixing frame comprises:

[0080] Support platform 16, support bar 17, core rack bottom plate 18 (a), core rack bottom plate 18 (b), core rack retaining ring 19 (a), core rack retaining ring 19 (b); wherein,

[0081] One end of the support bar 17 is connected to the bottle cap 14, and the other end is connected to the support platform 16 through a buffer device 20; a plurality of blocks 21 are arranged horizontally on the support bar 17, and a plurality of detachable core rack bottom plates 18 and core rack retaining rings 19 are arranged on the block 21, and the core rack bottom plate 18 is used to place and carry core samples.

[0082] Optionally, the buffer device 20 includes:

[0083] The spring is used to prevent the core rack bottom plate 18 from hitting the support platform 16.

[0084] It should be noted that, in order to achieve the same purpose, the buffer device 20 can also be selected according to actual needs.

[0085] As an example:

[0086] An inner liner opening 12 is provided on the inner liner 4;

[0087] The core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the interior of the inner liner 4;

[0088] A bottle cap 14 is provided on the top of the core fixing device 25, and an electronic temperature sensor 13 is provided on the bottle cap 14, and the electronic temperature sensor 13 is used to monitor the temperature of the inner tank;

[0089] A fixing frame 15 is provided at the bottom of the bottle cap 14 and extends to the interior of the inner liner 4;

[0090] Liquid nitrogen is injected into the interlayer 5 through the fluid input pipe 7 to absorb the heat of the inner container, thereby achieving the purpose of rapid freezing;

[0091] The fixing frame 15 includes a support platform 16, a support bar 17, a core rack bottom plate 18 and a core rack retaining ring 19; wherein one end of the support bar 17 is connected to the bottle cap 14, and the other end is connected to the support platform 16 through a buffer device 20;

[0092] A plurality of blocks 21 are arranged in the horizontal direction above the support bar 17, and a plurality of detachable core rack bottom plates 18 and core rack retaining rings 19 are arranged above the block blocks 21. A plurality of shale core samples can be stored according to actual needs, and the height between the plurality of shale core samples can also be flexibly adjusted according to the weight of the placed core samples.

[0093] In some possible situations, the device for freezing the core disclosed in this embodiment may include a liquid nitrogen tank, a handle and a universal wheel (see Figure 2 ).

[0094] In some embodiments, it also includes:

[0095] A handle is provided on the top of the housing 3 and is used to take or move the core freezing device.

[0096] As an example, the handle may include a horizontal rod 1 and a vertical bracket 2, and the liquid nitrogen tank can be more conveniently picked up and moved by the handle.

[0097] In some embodiments, it also includes:

[0098] A sliding device is arranged at the bottom of the shell 3 and is used to move the core freezing device.

[0099] As an example, the sliding device includes a universal wheel, and a wheel 9 for movement and a fixed bar 10 for fixing the universal wheel are installed on the universal wheel.

[0100] For example, the universal wheel may be arranged on the bottom or base of the housing 3, wherein the universal wheel may include a wheel 9 and a fixed stop bar 10, so as to facilitate the movement and fixation of the core freezing device.

[0101] It can be understood by those skilled in the art that the sliding device can be selected according to actual needs as long as the purpose of moving and fixing the core freezing device (or liquid nitrogen tank) can be achieved.

[0102] It can be understood by those skilled in the art that Figure 1 and Figure 2 The structure shown in the figure does not constitute a limitation on the device of the embodiment of the present application, and may include more or fewer modules / units than shown in the figure, or a combination of certain modules / units, or different module / unit arrangements.

[0103] The core freezing device provided in this embodiment includes: a shell 3; an inner liner 4, which is arranged inside the shell 3 and is used to fix the core fixing device 25 through the inner liner opening 12, so as to form an interlayer 5 for storing an inert fluid between the shell 3 and the inner liner 4, and the inert fluid is used to absorb the heat of the inner liner 4; a fluid input pipe 7, which is arranged on the shell 3 and is used to introduce the inert fluid into the interlayer 5; a fluid output pipe 8, which is arranged on the shell 3 and is used to output the inert fluid from the interlayer 5; a temperature and pressure sensor 11, which is arranged on the shell 3 and is used to detect the temperature and pressure inside the inner liner 4 and the interlayer 5; the core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the inside of the inner liner 4, and is used to store core samples. The use of the device disclosed in the present application can reduce the volatilization of light oil in the drilling core, which not only ensures the integrity of the core sample, but also can effectively obtain the oil content of the rock and reduce the error of subsequent experimental data. It also has the advantages of simple operation, high accuracy, and easy promotion.

[0104] Embodiment 2

[0105] This embodiment provides a core freezing control method, which can be applied to the core freezing device as described in the first embodiment. Figure 3 A flow chart of a core freezing control method provided in an embodiment of the present application is as follows: Figure 3As shown, the core freezing control method disclosed in this embodiment includes the following steps:

[0106] Step 310: Control the first fluid valve on the fluid input pipe to perform an opening operation, so that the inert fluid flows into the interlayer through the fluid input pipe, so as to freeze the core sample stored in the core fixing device in the inner tank;

[0107] Step 320, obtaining the fluid pressure inside the interlayer detected by the temperature and pressure sensor;

[0108] Step 330: When the fluid pressure is not less than a preset pressure value, control the second fluid valve on the fluid output pipe to open so that the inert fluid in the interlayer flows out through the fluid output pipe, so that the fluid pressure inside the interlayer is maintained within a preset range;

[0109] Step 340, obtaining the current temperature inside the inner container detected by the temperature and pressure sensor;

[0110] Step 350: When the current temperature meets the preset conditions, control the inner tank to maintain the current temperature and continue the freezing operation of the core sample at the current temperature for a preset time.

[0111] It should be noted that the preset pressure value and the preset range can be set according to actual needs. One of the purposes of setting the preset pressure value and the preset range in this embodiment is to enable the core sample stored in the core freezing device to meet the preset conditions as soon as possible.

[0112] It should be further explained that the preset condition can be set as the current temperature is not higher than the preset temperature, where the preset temperature can be set to -50°C; in addition, the preset time can also be set according to actual needs, for example, it can be set to 48 hours.

[0113] In some embodiments, before controlling the first fluid valve to perform an opening operation, the method further includes:

[0114] Placing the core sample on the bottom plate of the core holder in the core fixture;

[0115] The bottle cap and the inner liner opening of the core fixing device are controlled to perform a screwing operation so that the core fixing device is in a sealed state.

[0116] It should be noted that the assembly steps of the various parts of the core freezing device will not be described in detail in this embodiment.

[0117] As an example, see Figure 4 , which may specifically include the following steps:

[0118] Combine the core rack bottom plate 18 (a) and the core rack retaining ring 19 (a), and combine the core rack bottom plate 18 (b) and the core rack retaining ring 19 (b) to form two core racks, and install the stopper 21, which is placed on the support bar 17 to fix the upper core rack combination;

[0119] Place the drilling core sample 22 and the core sample 23 on corresponding core racks respectively;

[0120] The fixing frame 15 is placed in the inner liner 4, and the bottle cap 14 and the inner liner opening 12 are screwed together to ensure the sealing connection of the core fixing device, and the real-time temperature inside the core fixing device is monitored by the electronic temperature sensor 13;

[0121] Open the valve 6 (b) of the fluid input pipe 7 and inject the liquid nitrogen 24 into the interlayer 5 so that the liquid nitrogen absorbs the temperature in the inner container 4, thereby achieving the purpose of cooling;

[0122] After absorbing heat, the liquid nitrogen changes from liquid to gas, which increases the pressure in the interlayer 5;

[0123] At this time, the pressure inside the interlayer 5 is observed by the integrated temperature and pressure sensor 11;

[0124] When the pressure inside the interlayer 5 reaches a certain value (preset pressure value), the valve 6 (a) of the fluid output pipe 8 is opened to release the nitrogen 24 stored inside the interlayer 5;

[0125] The real-time temperature of the inner container 4 is observed through the integrated temperature and pressure sensor 11 and the electronic temperature sensor 13 to ensure that the required freezing temperature of -50°C is reached;

[0126] Lift the handle or use the universal wheel to move the liquid nitrogen tank to the corresponding core storage. After the core samples are frozen for 48 hours, take out two cores and place them in the sample cold storage for storage, pending subsequent sampling for experimental analysis and testing such as oil content.

[0127] It should be noted that the core freezing device in this embodiment is the core freezing device described in Embodiment 1, which includes:

[0128] Shell 3;

[0129] The inner liner 4 is arranged inside the shell 3 and is used to fix the core fixing device 25 through the inner liner opening 12 to form an interlayer 5 for storing an inert fluid between the shell 3 and the inner liner 4, and the inert fluid is used to absorb the heat of the inner liner 4;

[0130] A fluid input pipe 7, disposed on the housing 3, for introducing the inert fluid into the interlayer 5;

[0131] A fluid outlet pipe 8, disposed on the housing 3, and used for outlet the inert fluid from the interlayer 5;

[0132] A temperature and pressure sensor 11 is provided on the housing 3 and is used to detect the temperature and pressure inside the inner liner 4 and the interlayer 5;

[0133] The core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the interior of the inner liner 4 for storing core samples.

[0134] Those skilled in the art can understand that, in this embodiment, the interlayer 5 for storing the inert fluid is a hollow interlayer.

[0135] It should be noted that, in this embodiment, the entire body formed by the shell and the liner can be referred to as a liquid nitrogen tank body.

[0136] It should be further explained that the inert fluid includes liquid nitrogen, and the inert fluid can also be selected according to actual needs.

[0137] As an example, the liquid nitrogen tank body includes an inner liner 4 and a shell 3 , and an interlayer 5 is provided between the inner liner 4 and the shell 3 .

[0138] In some embodiments, a first fluid valve 6 (b) is provided on the fluid input pipe 7, which is used to control the switch of the fluid input pipe 7, so that the inert fluid flows into the interlayer 5 when the first fluid valve 6 (b) is in an open state;

[0139] A second fluid valve 6 ( a ) is provided on the fluid output pipe 8 for controlling the opening and closing of the fluid output pipe 8 so that the inert fluid can flow out of the interlayer 5 when the second fluid valve 6 ( a ) is in an open state.

[0140] As an example, a fluid input pipe 7 and a fluid output pipe 8 are provided on the shell 3 and are connected to the interlayer 5 , and fluid valves are provided on both the fluid input pipe 7 and the fluid output pipe 8 .

[0141] As an example, an integrated temperature and pressure sensor 11 is provided on the shell 3, one connector extends into the inner liner 4, and the other connector extends into the interlayer 5, so as to facilitate the detection of the temperature and pressure of the inner liner 4 and the interlayer 5, thereby ensuring that the core sample is frozen at the most suitable temperature.

[0142] Please refer to the following Figure 2 In some embodiments, the core fixing device 25 comprises:

[0143] A bottle cap 14 is disposed on the top of the core fixing device 25 and is used to screw the inner liner opening 12 to seal the core fixing device 25;

[0144] A temperature sensor 13 is disposed on the top of the bottle cap 14 and is used to detect the temperature inside the core fixing device 25;

[0145] The fixing frame 15 is disposed at the bottom of the bottle cap 14 and extends to the interior of the inner liner 4 for carrying the core sample.

[0146] In some embodiments, the fixing frame comprises:

[0147] Support platform 16, support bar 17, core rack bottom plate 18 (a), core rack bottom plate 18 (b), core rack retaining ring 19 (a), core rack retaining ring 19 (b); wherein,

[0148] One end of the support bar 17 is connected to the bottle cap 14, and the other end is connected to the support platform 16 through a buffer device 20; a plurality of blocks 21 are arranged horizontally on the support bar 17, and a plurality of detachable core rack bottom plates 18 and core rack retaining rings 19 are arranged on the block 21, and the core rack bottom plate 18 is used to place and carry core samples.

[0149] Optionally, the buffer device 20 includes:

[0150] The spring is used to prevent the core rack bottom plate 18 from hitting the support platform 16.

[0151] It should be noted that, in order to achieve the same purpose, the buffer device 20 can also be selected according to actual needs.

[0152] As an example:

[0153] An inner liner opening 12 is provided on the inner liner 4;

[0154] The core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the interior of the inner liner 4;

[0155] A bottle cap 14 is provided on the top of the core fixing device 25, and an electronic temperature sensor 13 is provided on the bottle cap 14, and the electronic temperature sensor 13 is used to monitor the temperature of the inner tank;

[0156] A fixing frame 15 is provided at the bottom of the bottle cap 14 and extends to the interior of the inner liner 4;

[0157] Liquid nitrogen is injected into the interlayer 5 through the fluid input pipe 7 to absorb the heat of the inner container, thereby achieving the purpose of rapid freezing;

[0158] The fixing frame 15 includes a support platform 16, a support bar 17, a core rack bottom plate 18 and a core rack retaining ring 19; wherein one end of the support bar 17 is connected to the bottle cap 14, and the other end is connected to the support platform 16 through a buffer device 20;

[0159] A plurality of blocks 21 are arranged in the horizontal direction above the support bar 17, and a plurality of detachable core rack bottom plates 18 and core rack retaining rings 19 are arranged above the block blocks 21. A plurality of shale core samples can be stored according to actual needs, and the height between the plurality of shale core samples can also be flexibly adjusted according to the weight of the placed core samples.

[0160] In some possible situations, the device for freezing the core disclosed in this embodiment may include a liquid nitrogen tank, a handle and a universal wheel (see Figure 2 ).

[0161] In some embodiments, it also includes:

[0162] A handle is provided on the top of the housing 3 and is used to take or move the core freezing device.

[0163] As an example, the handle may include a horizontal rod 1 and a vertical bracket 2, and the liquid nitrogen tank can be more conveniently picked up and moved by the handle.

[0164] In some embodiments, it also includes:

[0165] A sliding device is arranged at the bottom of the shell 3 and is used to move the core freezing device.

[0166] As an example, the sliding device includes a universal wheel, and a wheel 9 for movement and a fixed bar 10 for fixing the universal wheel are installed on the universal wheel.

[0167] For example, the universal wheel may be arranged on the bottom or base of the housing 3, wherein the universal wheel may include a wheel 9 and a fixed stop bar 10, so as to facilitate the movement and fixation of the core freezing device.

[0168] It can be understood by those skilled in the art that the sliding device can be selected according to actual needs as long as the purpose of moving and fixing the core freezing device (or liquid nitrogen tank) can be achieved.

[0169] It can be understood by those skilled in the art that Figure 1 and Figure 2 The structure shown in the figure does not constitute a limitation on the device of the embodiment of the present application, and may include more or fewer modules / units than shown in the figure, or a combination of certain modules / units, or different module / unit arrangements.

[0170] The core freezing control method disclosed in this embodiment includes: step 310, controlling the first fluid valve located on the fluid input pipe to perform an opening operation, so that the inert fluid flows into the interlayer through the fluid input pipe, so as to freeze the core sample stored in the core fixing device in the inner tank; step 320, obtaining the fluid pressure inside the interlayer detected by the temperature and pressure sensor; step 330, when the fluid pressure is not less than a preset pressure value, controlling the second fluid valve located on the fluid output pipe to perform an opening operation to make the inert fluid in the interlayer flow out through the fluid output pipe, so that the fluid pressure inside the interlayer is maintained within a preset range; step 340, obtaining the current temperature inside the inner tank detected by the temperature and pressure sensor; step 350, when the current temperature meets the preset conditions, controlling the inner tank to maintain the current temperature and continue the freezing operation of the core sample at the current temperature for a preset time. The core freezing control method disclosed in this embodiment can reduce the volatilization of light oil in the drilling core, ensure the integrity of the core sample, effectively obtain the oil content of the rock and reduce the error of subsequent experimental data. It has the advantages of simple operation, high accuracy, and easy promotion.

[0171] Embodiment 3

[0172] This embodiment provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, all or part of the steps of the method in the above method embodiment can be implemented:

[0173] Step 310, controlling a first fluid valve on the fluid input pipe to perform an opening operation, so that an inert fluid flows into the interlayer through the fluid input pipe, so as to freeze the core sample stored in the core fixing device in the inner liner;

[0174] Step 320, obtaining the fluid pressure inside the interlayer detected by the temperature and pressure sensor;

[0175] Step 330: When the fluid pressure is not less than a preset pressure value, control the second fluid valve on the fluid output pipe to open so that the inert fluid in the interlayer flows out through the fluid output pipe, so that the fluid pressure inside the interlayer is maintained within a preset range;

[0176] Step 340, obtaining the current temperature inside the inner container detected by the temperature and pressure sensor;

[0177] Step 350: When the current temperature meets the preset conditions, control the inner tank to maintain the current temperature and continue the freezing operation of the core sample at the current temperature for a preset time.

[0178] Among them, the computer-readable storage medium may also include computer programs, data files, data structures, etc. alone, or include a combination thereof. The computer-readable storage medium or computer program may be specifically designed and understood by a technician in the field of computer software, or the computer-readable storage medium may be known and available to a technician in the field of computer software. Examples of computer-readable storage media include: magnetic media, such as hard disks, floppy disks, and tapes; optical media, such as CDROM disks and DVDs; magneto-optical media, such as optical disks; and hardware devices, specifically configured to store and execute computer programs, such as read-only memory (ROM), random access memory (RAM), flash memory; or servers, app application stores, etc. Examples of computer programs include machine code (e.g., code generated by a compiler) and files containing high-level code, which can be executed by a computer using an interpreter. The described hardware device may be configured to be used as one or more software modules to perform the operations and methods described above, and vice versa. In addition, the computer-readable storage medium may be distributed in a networked computer system, and program code or computer programs may be stored and executed in a decentralized manner.

[0179] Embodiment 4

[0180] This embodiment provides a computer program product. The computer program product includes a computer program or instructions, and when the computer program or instructions are executed by a processor, all or part of the steps of the method in the above method embodiment are implemented:

[0181] Step 310, controlling a first fluid valve on the fluid input pipe to perform an opening operation, so that an inert fluid flows into the interlayer through the fluid input pipe, so as to freeze the core sample stored in the core fixing device in the inner liner;

[0182] Step 320, obtaining the fluid pressure inside the interlayer detected by the temperature and pressure sensor;

[0183] Step 330: When the fluid pressure is not less than a preset pressure value, control the second fluid valve on the fluid output pipe to open so that the inert fluid in the interlayer flows out through the fluid output pipe, so that the fluid pressure inside the interlayer is maintained within a preset range;

[0184] Step 340, obtaining the current temperature inside the inner container detected by the temperature and pressure sensor;

[0185] Step 350: When the current temperature meets the preset conditions, control the inner tank to maintain the current temperature and continue the freezing operation of the core sample at the current temperature for a preset time.

[0186] Further, the computer program product may include one or more computer executable components configured to perform the embodiments when the program is run; the computer program product may also include a computer program tangibly contained on a readable medium, the computer program including program code for performing any method in the embodiments of the present disclosure. In such an embodiment, the computer program may be downloaded and installed from a network through a communication portion, and / or installed from a removable medium.

[0187] Embodiment 5

[0188] This embodiment provides a control device. The control device disclosed in this embodiment includes:

[0189] A memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, all or part of the steps of the core freezing control method described in the above method embodiment are implemented.

[0190] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the core freezing control method can refer to the corresponding steps in the aforementioned method embodiment, and this embodiment will not be repeated here.

[0191] Embodiment 6

[0192] This embodiment provides a core freezing control system, including a core freezing device and a control device.

[0193] It should be noted that the core freezing device in this embodiment is the core freezing device described in Embodiment 1, which includes:

[0194] Shell 3;

[0195] The inner liner 4 is arranged inside the shell 3 and is used to fix the core fixing device 25 through the inner liner opening 12 to form an interlayer 5 for storing an inert fluid between the shell 3 and the inner liner 4, and the inert fluid is used to absorb the heat of the inner liner 4;

[0196] A fluid input pipe 7, disposed on the housing 3, for introducing the inert fluid into the interlayer 5;

[0197] A fluid outlet pipe 8, disposed on the housing 3, and used for outlet the inert fluid from the interlayer 5;

[0198] A temperature and pressure sensor 11 is provided on the housing 3 and is used to detect the temperature and pressure inside the inner liner 4 and the interlayer 5;

[0199] The core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the interior of the inner liner 4 for storing core samples.

[0200] Those skilled in the art can understand that, in this embodiment, the interlayer 5 for storing the inert fluid is a hollow interlayer.

[0201] It should be noted that, in this embodiment, the entire body formed by the shell and the liner can be referred to as a liquid nitrogen tank body.

[0202] It should be further explained that the inert fluid includes liquid nitrogen, and the inert fluid can also be selected according to actual needs.

[0203] As an example, the liquid nitrogen tank body includes an inner liner 4 and a shell 3 , and an interlayer 5 is provided between the inner liner 4 and the shell 3 .

[0204] In some embodiments, a first fluid valve 6 (b) is provided on the fluid input pipe 7, which is used to control the switch of the fluid input pipe 7, so that the inert fluid flows into the interlayer 5 when the first fluid valve 6 (b) is in an open state;

[0205] A second fluid valve 6 ( a ) is provided on the fluid output pipe 8 for controlling the opening and closing of the fluid output pipe 8 so that the inert fluid can flow out of the interlayer 5 when the second fluid valve 6 ( a ) is in an open state.

[0206] As an example, a fluid input pipe 7 and a fluid output pipe 8 are provided on the shell 3 and are connected to the interlayer 5 , and fluid valves are provided on both the fluid input pipe 7 and the fluid output pipe 8 .

[0207] As an example, an integrated temperature and pressure sensor 11 is provided on the shell 3, one connector extends into the inner liner 4, and the other connector extends into the interlayer 5, so as to facilitate the detection of the temperature and pressure of the inner liner 4 and the interlayer 5, thereby ensuring that the core sample is frozen at the most suitable temperature.

[0208] Please refer to the following Figure 2 In some embodiments, the core fixing device 25 comprises:

[0209] A bottle cap 14 is disposed on the top of the core fixing device 25 and is used to screw the inner liner opening 12 to seal the core fixing device 25;

[0210] A temperature sensor 13 is disposed on the top of the bottle cap 14 and is used to detect the temperature inside the core fixing device 25;

[0211] The fixing frame 15 is disposed at the bottom of the bottle cap 14 and extends to the interior of the inner liner 4 for carrying the core sample.

[0212] In some embodiments, the fixing frame comprises:

[0213] Support platform 16, support bar 17, core rack bottom plate 18 (a), core rack bottom plate 18 (b), core rack retaining ring 19 (a), core rack retaining ring 19 (b); wherein,

[0214] One end of the support bar 17 is connected to the bottle cap 14, and the other end is connected to the support platform 16 through a buffer device 20; a plurality of blocks 21 are arranged horizontally on the support bar 17, and a plurality of detachable core rack bottom plates 18 and core rack retaining rings 19 are arranged on the block 21, and the core rack bottom plate 18 is used to place and carry core samples.

[0215] Optionally, the buffer device 20 includes:

[0216] The spring is used to prevent the core rack bottom plate 18 from hitting the support platform 16.

[0217] It should be noted that, in order to achieve the same purpose, the buffer device 20 can also be selected according to actual needs.

[0218] As an example:

[0219] An inner liner opening 12 is provided on the inner liner 4;

[0220] The core fixing device 25 is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the interior of the inner liner 4;

[0221] A bottle cap 14 is provided on the top of the core fixing device 25, and an electronic temperature sensor 13 is provided on the bottle cap 14, and the electronic temperature sensor 13 is used to monitor the temperature of the inner tank;

[0222] A fixing frame 15 is provided at the bottom of the bottle cap 14 and extends to the interior of the inner liner 4;

[0223] Liquid nitrogen is injected into the interlayer 5 through the fluid input pipe 7 to absorb the heat of the inner container, thereby achieving the purpose of rapid freezing;

[0224] The fixing frame 15 includes a support platform 16, a support bar 17, a core rack bottom plate 18 and a core rack retaining ring 19; wherein one end of the support bar 17 is connected to the bottle cap 14, and the other end is connected to the support platform 16 through a buffer device 20;

[0225] A plurality of blocks 21 are arranged in the horizontal direction above the support bar 17, and a plurality of detachable core rack bottom plates 18 and core rack retaining rings 19 are arranged above the block blocks 21. A plurality of shale core samples can be stored according to actual needs, and the height between the plurality of shale core samples can also be flexibly adjusted according to the weight of the placed core samples.

[0226] In some possible situations, the device for freezing the core disclosed in this embodiment may include a liquid nitrogen tank, a handle and a universal wheel (see Figure 2 ).

[0227] In some embodiments, it also includes:

[0228] A handle is provided on the top of the housing 3 and is used to take or move the core freezing device.

[0229] As an example, the handle may include a horizontal rod 1 and a vertical bracket 2, and the liquid nitrogen tank can be more conveniently picked up and moved by the handle.

[0230] In some embodiments, it also includes:

[0231] A sliding device is arranged at the bottom of the shell 3 and is used to move the core freezing device.

[0232] As an example, the sliding device includes a universal wheel, and a wheel 9 for movement and a fixed bar 10 for fixing the universal wheel are installed on the universal wheel.

[0233] For example, the universal wheel may be arranged on the bottom or base of the housing 3, wherein the universal wheel may include a wheel 9 and a fixed stop bar 10, so as to facilitate the movement and fixation of the core freezing device.

[0234] It can be understood by those skilled in the art that the sliding device can be selected according to actual needs as long as the purpose of moving and fixing the core freezing device (or liquid nitrogen tank) can be achieved.

[0235] It can be understood by those skilled in the art that Figure 1 and Figure 2 The structure shown in the figure does not constitute a limitation on the device of the embodiment of the present application, and may include more or fewer modules / units than shown in the figure, or a combination of certain modules / units, or different module / unit arrangements.

[0236] It can be understood by those skilled in the art that the control device in this embodiment is the control device described in the aforementioned embodiment 5, which includes: a memory and a processor, and a computer program is stored in the memory. When the computer program is executed by the processor, the core freezing control method described in the aforementioned method embodiment is implemented.

[0237] Technicians in the relevant field can clearly understand that, for the convenience and simplicity of description, the specific component modules of the core freezing device can refer to the specific description in the aforementioned device embodiment, and the specific working process of the control device can refer to the corresponding process in the aforementioned method embodiment, and this embodiment will not be repeated here.

[0238] In summary, the present application provides a core freezing device, a core freezing control method, a storage medium, a control device, and a core freezing control system. The device can reduce the volatilization of light oil in the drilling core, ensure the integrity of the core sample, effectively obtain the oil content of the rock and reduce the error of subsequent experimental data, and has the advantages of simple operation, high accuracy, and easy promotion. Specifically, it includes: a shell 3; an inner liner 4, which is arranged inside the shell 3 and is used to fix a core fixing device 25 through an inner liner opening 12, so as to form an interlayer 5 for storing an inert fluid between the shell 3 and the inner liner 4, and the inert fluid is used to absorb the heat of the inner liner 4; a fluid input pipe 7, which is arranged on the shell 3 and is used to introduce the inert fluid into the interlayer 5; a fluid output pipe 8, which is arranged on the shell 3 and is used to output the inert fluid from the interlayer 5; a temperature and pressure sensor 11, which is arranged on the shell 3 and is used to detect the temperature and pressure inside the inner liner 4 and the interlayer 5; a core fixing device 25, which is fixed to the top of the shell 3 through the inner liner opening 12 and extends to the inside of the inner liner 4, and is used to store core samples. The device disclosed in the present application can reduce the volatilization of light oil in the drilling core, which not only ensures the integrity of the core sample, but also can effectively obtain the oil content of the rock and reduce the error of subsequent experimental data, and also has the advantages of simple operation, high accuracy, and easy promotion.

[0239] In addition, it should be understood that the method or device disclosed in the embodiments provided in the present application can also be implemented in other ways. The method or device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the methods and devices according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a computer program segment or a part of a computer program, and the module, computer program segment or a part of a computer program contains one or more computer programs for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings, and can actually be executed in parallel. They can also be executed in the opposite order sometimes, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of dedicated hardware and computer programs.

[0240] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, device or equipment including the elements; if there is a description of "first", "second", etc., it is only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features; in the description of this application, unless otherwise specified, the terms "multiple" and "multiple" mean at least two; if there is a description of a server, it should be noted that the server can be an independent physical server or terminal, or a server cluster composed of multiple physical servers, or a cloud server that can provide basic cloud computing services such as cloud servers, cloud databases, cloud storage and CDN; if there is a description of a smart terminal or mobile device in this application, it should be noted that the smart terminal or mobile device can be a mobile phone, a tablet computer, a smart watch, a netbook, a wearable electronic device, a personal digital assistant (PDA), an augmented reality technology device (AR), a virtual reality device (VR), a smart TV, a smart speaker, a personal computer (PC), a tablet computer, a smart phone, a smart TV, a smart speaker, a smart phone ... Computer, referred to as PC), etc., but not limited to this, the present application does not specifically limit the specific form of the smart terminal or mobile device.

[0241] Finally, it should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "an example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0242] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary, and the contents described are only embodiments adopted for the convenience of understanding the present application, and are not intended to limit the present application. Any technician in the technical field to which the present application belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present application, but the scope of protection of the present application shall still be based on the scope defined in the attached claims.

Claims

1. A core freezing device, characterized in that: include: case; An inner liner is arranged inside the shell and is used to fix the core fixing device through the inner liner opening to form an interlayer for storing an inert fluid between the shell and the inner liner, and the inert fluid is used to absorb the heat of the inner liner; A fluid input pipe, disposed on the shell, and used to introduce the inert fluid into the interlayer; A fluid output pipe, disposed on the housing, and used to output the inert fluid from the interlayer; A temperature and pressure sensor, disposed on the housing, for detecting the temperature and pressure inside the inner container and the interlayer; A core fixing device is fixed to the top of the shell through the inner liner opening and extends to the interior of the inner liner, and is used for storing core samples.

2. The core freezing device according to claim 1, characterized in that: Also includes: A handle is arranged on the top of the shell and is used to take or move the core freezing device.

3. The core freezing device according to claim 1, characterized in that: Also includes: A sliding device is arranged at the bottom of the shell and is used for moving the core freezing device.

4. The core freezing device according to claim 1, characterized in that: A first fluid valve is provided on the fluid input pipe, and is used to control the switch of the fluid input pipe, so that the inert fluid flows into the interlayer when the first fluid valve is in an open state; A second fluid valve is arranged on the fluid output pipe, and is used to control the switch of the fluid output pipe, so that the inert fluid flows out of the interlayer when the second fluid valve is in an open state.

5. The core freezing device according to claim 1, characterized in that: The core fixing device comprises: A bottle cap, arranged on the top of the core fixing device, and used for screwing the inner liner opening to seal the core fixing device; A temperature sensor, disposed on the top of the bottle cap, for detecting the temperature inside the core fixing device; A fixing frame is arranged at the bottom of the bottle cap and extends to the interior of the inner container, and is used for carrying the core sample.

6. The core freezing device according to claim 5, characterized in that: The fixing frame comprises: Support platform, support bar, core rack bottom plate and core rack retaining ring; wherein, One end of the support bar is connected to the bottle cap, and the other end is connected to the support platform through a buffer device; a plurality of blocks are arranged horizontally on the support bar, and a plurality of detachable core rack bottom plates and core rack retaining rings are arranged on the block, and the core rack bottom plate is used to carry the core sample.

7. A core freezing control method, implemented based on the core freezing device according to any one of claims 1 to 6, characterized in that: include: Controlling a first fluid valve on a fluid input pipe to perform an opening operation, so that an inert fluid flows into the interlayer through the fluid input pipe, so as to freeze the core sample stored in the core fixing device in the inner tank; Acquiring the fluid pressure inside the interlayer detected by the temperature and pressure sensor; When the fluid pressure is not less than a preset pressure value, the second fluid valve on the fluid output pipe is controlled to open so that the inert fluid in the interlayer flows out through the fluid output pipe, so that the fluid pressure inside the interlayer is maintained within a preset range; Obtain the current temperature inside the inner tank detected by the temperature and pressure sensor; When the current temperature meets the preset conditions, the inner tank is controlled to maintain the current temperature and the freezing operation of the core sample at the current temperature continues for a preset time.

8. The core freezing control method according to claim 7, characterized in that: Before controlling the first fluid valve to perform the opening operation, the method further includes: Placing the core sample on the bottom plate of the core holder in the core fixture; The bottle cap and the inner liner opening of the core fixing device are controlled to perform a screwing operation so that the core fixing device is in a sealed state.

9. A control device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the core freezing control method according to any one of claims 7 to 8 is implemented.

10. A core freezing control system, characterized in that: include: The core freezing device according to any one of claims 1 to 6; The control device as claimed in claim 9.

11. A computer-readable storage medium, characterized in that: The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements the core freezing control method according to any one of claims 7 to 8.

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